All email services scan your email. They do this routinely to provide such popular features as spam filtering, virus detection, search, spellchecking, forwarding, auto-responding, flagging urgent mess ages, converting incoming email into cell phone text messages, automatic saving and sorting into folders, converting text URLs to clickable links, and reading messages to the blind. These features are widely accepted, trusted, and used by hundreds of millions of people every day.

Google scans the text of Gmail messages in order to filter spam and detect viruses, just as all major webmail services do. Google also uses this scanning technology to deliver targeted text ads and other related information. This is completely automated and involves no humans.

When a user opens an email message, computers scan the text and then instantaneously display relevant information that is matched to the text of the message. Once the message is closed, ads are no longer displayed. It is important to note that the ads generated by this matching process are dynamically generated each time a message is opened by the user--in other words, Google does not attach particular ads to individual messages or to users' accounts.